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Some existing PCI adapters with UEFI option ROMs make unaligned requests through the PCI I/O Protocol. Add support for unaligned requests in the PCI IO protocol implementation in the PCI Bus driver to be compatible with those UEFI option ROMs.

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This solution defines a PCD Feature Flag to enabled support for unaligned requests through the PCI I/O Protocol.  This flag is disabled by default. Platforms that do want to support such EFI/UEFI drivers that make unaligned PCI I/O requests should enable this feature.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11016 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
rsun3
2010-11-09 03:41:03 +00:00
parent 8835954602
commit aeeb84bab4
3 changed files with 143 additions and 0 deletions
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5
MdeModulePkg/MdeModulePkg.dec
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@@ -269,6 +269,11 @@
## This PCD specified whether ACPI SDT protocol is installed.
gEfiMdeModulePkgTokenSpaceGuid.PcdInstallAcpiSdtProtocol|FALSE|BOOLEAN|0x0001004d
## If TRUE, then unaligned I/O, MMIO, and PCI Configuration cycles through the PCI I/O Protocol are enabled.
# If FALSE, then unaligned I/O, MMIO, and PCI Configuration cycles through the PCI I/O Protocol are disabled.
# The default value for this PCD is to disable support for unaligned PCI I/O Protocol requests.
gEfiMdeModulePkgTokenSpaceGuid.PcdUnalignedPciIoEnable|FALSE|BOOLEAN|0x0001003e
[PcdsFeatureFlag.IA32, PcdsFeatureFlag.X64]
##
# This feature flag specifies whether DxeIpl switches to long mode to enter DXE phase.